Import akshare lazzily. (#4708)

### What problem does this PR solve?

#4696

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/component/akshare.py

 #
 from abc import ABC
 import pandas as pd
-import akshare as ak
 from agent.component.base import ComponentBase, ComponentParamBase
 
 
     component_name = "AkShare"
 
     def _run(self, history, **kwargs):
+        import akshare as ak
         ans = self.get_input()
         ans = ",".join(ans["content"]) if "content" in ans else ""
         if not ans: